Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
Table 6. Faults and Effects on the Network (Continued)
Fault
Manifestation
Effect on Network
QRT and QSE
Port Failures
No SE_SOC_OUT generation.
Loss-of-lock on special cod- Port shut down until condition is
ing on SE_SOC_IN(3:0).
fixed, as port failure is sent to the
source of data by lack of backpres-
sure indication.
No data or invalid data generated.
No BP_ACK_OUT(3:0) generation.
Invalid idle cell with some
10/01 fail or parity error.
Port shut down on receipt of first
bad idle cell until condition is
fixed, as port failure is sent to the
source of data by lack of backpres-
sure indication.
Loss-of-lock on special cod- Port shut down until condition is
ing on BP_ACK_IN(3:0).
fixed.
QSE Chip Fail- Multicast handling.
ures
Cell loss or generation.
Detection possible using marked
cell count.
Multicast cell pool buffer.
Parity error in header or cell. Detection only in header; not in
payload.
Partial cell buffers.
Parity error in header and
cell.
Parity error.
Multicast and unicast selection net-
works.
Cell gets out on wrong port, Cell to wrong port may be noticed
cell duplicated, or cell lost.
by receiving QRT, if that VC is
not active. Cell duplication and
cell loss detection possible using
marked cell count.
Arbiter.
Cell lost.
Detection possible using marked
cell count.
54
PMC [ PMC-SIERRA, INC ]
